refactor: replace hardcoded hex colors with theme tokens, move data/ to root

- Add --color-green-mid token (#4a7a55) to @theme for dimmer stat values
- Replace all text-[#hex]/bg-[#hex] arbitrary values with named tokens:
  text-green, text-green-light, text-green-sec, text-green-muted,
  text-green-dark, text-green-mid, text-text, bg-card, bg-bg, border-border
- Replace rgba(34,197,94,X) inline styles with bg-green/X opacity modifiers
- Convert single-prop style={{ borderColor/background }} to className
- Fix SVG stroke="#dff5e8" → stroke="currentColor"
- Use CSS variables in globals.css base styles (background-color, color)
- Move app/data/wikipedia/ → data/ (project root, not inside Next.js app dir)
- Update Dockerfile, seed.ts, scrape-wikipedia.ts paths accordingly
- Remove unused app/data/world_cup.csv

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

data/1982/worldcup.groups.json

@@ -0,0 +1,90 @@
+{
+  "groups": [
+    {
+      "name": "Group 1",
+      "teams": [
+        "Italy",
+        "Poland",
+        "Peru",
+        "Cameroon"
+      ]
+    },
+    {
+      "name": "Group 2",
+      "teams": [
+        "West Germany",
+        "Algeria",
+        "Chile",
+        "Austria"
+      ]
+    },
+    {
+      "name": "Group 3",
+      "teams": [
+        "Argentina",
+        "Belgium",
+        "Hungary",
+        "El Salvador"
+      ]
+    },
+    {
+      "name": "Group 4",
+      "teams": [
+        "England",
+        "France",
+        "Czechoslovakia",
+        "Kuwait"
+      ]
+    },
+    {
+      "name": "Group 5",
+      "teams": [
+        "Spain",
+        "Honduras",
+        "Yugoslavia",
+        "Northern Ireland"
+      ]
+    },
+    {
+      "name": "Group 6",
+      "teams": [
+        "Brazil",
+        "Soviet Union",
+        "Scotland",
+        "New Zealand"
+      ]
+    },
+    {
+      "name": "Group A",
+      "teams": [
+        "Poland",
+        "Belgium",
+        "Soviet Union"
+      ]
+    },
+    {
+      "name": "Group B",
+      "teams": [
+        "West Germany",
+        "England",
+        "Spain"
+      ]
+    },
+    {
+      "name": "Group C",
+      "teams": [
+        "Italy",
+        "Argentina",
+        "Brazil"
+      ]
+    },
+    {
+      "name": "Group D",
+      "teams": [
+        "Austria",
+        "France",
+        "Northern Ireland"
+      ]
+    }
+  ]
+}

data/1982/worldcup.meta.json

@@ -0,0 +1,8 @@
+{
+  "host": "Spain",
+  "teams_count": 24,
+  "winner": "Italy",
+  "runner_up": "West Germany",
+  "third_place": "Poland",
+  "fourth_place": "France"
+}

data/1982/worldcup.stadiums.json

@@ -0,0 +1,80 @@
+{
+  "stadiums": [
+    {
+      "name": "Camp Nou",
+      "city": "Barcelona"
+    },
+    {
+      "name": "Ramón Sánchez Pizjuán Stadium",
+      "city": "Seville"
+    },
+    {
+      "name": "Estadio José Rico Pérez",
+      "city": "Alicante"
+    },
+    {
+      "name": "Santiago Bernabéu",
+      "city": "Madrid"
+    },
+    {
+      "name": "Balaídos",
+      "city": "Vigo"
+    },
+    {
+      "name": "Estadio de Riazor",
+      "city": "A Coruña"
+    },
+    {
+      "name": "El Molinón",
+      "city": "Gijón"
+    },
+    {
+      "name": "Estadio Carlos Tartiere",
+      "city": "Oviedo"
+    },
+    {
+      "name": "Nuevo Estadio",
+      "city": "Elche"
+    },
+    {
+      "name": "San Mamés",
+      "city": "Bilbao"
+    },
+    {
+      "name": "Estadio José Zorrilla",
+      "city": "Valladolid"
+    },
+    {
+      "name": "Estadio Luis Casanova",
+      "city": "Valencia"
+    },
+    {
+      "name": "La Romareda",
+      "city": "Zaragoza"
+    },
+    {
+      "name": "Ramón Sánchez Pizjuán",
+      "city": "Seville"
+    },
+    {
+      "name": "La Rosaleda Stadium",
+      "city": "Málaga"
+    },
+    {
+      "name": "Estadio Benito Villamarín",
+      "city": "Seville"
+    },
+    {
+      "name": "Sarrià Stadium",
+      "city": "Barcelona"
+    },
+    {
+      "name": "Estadio Sarriá",
+      "city": "Barcelona"
+    },
+    {
+      "name": "Vicente Calderón",
+      "city": "Madrid"
+    }
+  ]
+}